Used mirror modifier to create an object but don't want the texture to be mirrored
Here I have an image with a red squiggle on one side and blue on the other. I have a plane that is mirrored and I have enabled 'U' texture mirroring on the modifier to allow the other half of the texture to appear on the mirrored side.



Depending on your mirror axis you may want to enable 'V' mapping instead.